preview pane is being annoying

as some of you may have noticed, the preview pane was a bit sketchy in the beta, as in it wouldn't stay in one place. i was hoping that would've been fixed for the RC, but it wasn't. every time i close an explorer window, the preview pane jumps to the side of window, leaving almost no room for icons. is there any way to fix this? the preview pane is very helpful and i really want to use it, but it not staying in one place makes it near impossible.

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